Rpm Meter Needle Vibrating wildly(Mehran)

Salam to all.
2 months back i bought a new mehran driven 300km till now.
Recently i installed rpm meter in my mehran.Problem is that when i start the car its needle vibrates wildly.and it doesnt show correct reading either.on idling speed it jumps between 3000 to 4-4500.electricion told me that the car is in running to thats why it is showing that reading.after first check up it will be normal.so i wanna ask is he telling the truth ya apni jan churany k lye bola h.also tell me how to fix this problem.waiting for ur reply.thanx in advance.

I believe the RPM meter in mehran works by getting a signal from the ignition.If the engine is running smooth then there is an issue with the meter.3-4.5k is very high reading for idle.

Qaiser Pal,I have not failed.But found 1 of 10,000 ways which doesn't work.....Toyota driver "I couldn't repair my brakes,so i made my horn louder"..When i was born i was so surprised that i didn't talked to one and half year..since light travel faster then sound,people appear bright until you hear them speak..If u can't convince them,confuse them

i think engine reps r high on idling.if i remember correctly meter has 5 wires 2 red 2 black n 1 green.but i cant figure out why that needle is going nuts.i will check wiring and hopefully attach pics so it will be cleared howz the wiring done.

bro i got the same problm whn i 1st installe it..man just detach the rpm wire from coil n attach it with the wire on the distributor..i thnk thr is just one wire on distributor..just attatch rpm wire with it n problm wil be solvd